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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62841f178b3bf06e66d30b6684cd89af5e087ff3132a3cb6383b17a3700f09df' 
  AND token = 'uPI6NVPeFNm7UZrvt8H4+G4E9zcQthU6ldevNqeoE5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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