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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd337e9d51cac0513719f245f26ff72cd02c33ac7e15dd9e916d607a7ab4116b9' 
  AND token = 'IzOs3W7I2lYZtjAXR21wigGTNYSuPpUpWLMQ1mt+ul4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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