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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e9e8359f3400051399c5b5d4668ee5ac6d3999d29e597a636b4cc8f995c826' 
  AND token = '9Wgg+VPMen7d29Mh2GoQpN2WMX04a6x0t8qN6NQbMHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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