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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97ba3821b3de522fb75317e1207f87ddea0f46f1a2ca9a90e71d5360b61703e' 
  AND token = 'LqBILt5NY/iN9yMAuUaDuRDiGJpT3cwGxgzwXtn5gbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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