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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e521a9720909dc0902f66fc7f99b51c561f40a873c2626eb79c64860cbbe0185' 
  AND token = 'RhLE1e9B1sAqpv0yTEWARFt0nFHZ2yp837imYe5ciPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}