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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7dd15589cdf0e63b41f7fb1137c632ec4eef679c3999b69231871ff0f17f4c5' 
  AND token = '5xk9hYY/QVlydNGvAp1uovu77f5YaE7rEBLyvxDFus0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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