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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e551ea98f964d4cd2c9612892b8b1232ac66b5f8d8eceb03c5feabefac8a5c08' 
  AND token = '6gkxXioJ4MDGwJDFFdrS14KWoND3AVunnRGt8wsNrFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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