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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9991e0531edef7d736eba0043b73b92bb3233461d559bd7391058895ca535167' 
  AND token = '9UE3I21Hmzv9VvGMKxtCfJEDhaAqWQb+WVDg03+76/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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