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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25fe33b4d84cfe1b16b0aacd82b6c8d492061bb8706766b8b74a016fc160211' 
  AND token = '19i3SwchXgmGKfMGbmjSWYEJePWjHmO9SCsRWKJfSic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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