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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a132f3da5c17170f70ac725cbb3d634a7a607dda213ab1347af502c1e38325' 
  AND token = 'pDMz2Rycg6Q9jloyAG6xQI2E4N8+p3gqDnnmEpx+Rak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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