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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34452e44bfa9e7cdb2f869d9743d31a17a1bcb4a4c80d66e3f77eeccfda6a90b' 
  AND token = 'f0roIZVd+yHVnW2ATrpj5SP7lSFPwo9uFAnRzGWh4yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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