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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9c10a98be04cb52357667a30524a3fba8bb7b6f90d34fb6b72bb007242e2b6' 
  AND token = '938PNrT6uqFmWiqKMgZum8l3BZIaeyttjGI3GdOUFuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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