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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57cf4bf15bdf836d9c1c60b5b963bed510ce78dde4dfdef70e32cc8bf358eac' 
  AND token = 'APKuEFZgjGjvjc7PrvZ2y2OpmYBi2yy8m6HS2dl2hnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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