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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136843bd2caa62d1de0fd3aa93de3c1076a1e7f03fd0d7b02cb14cc288c07804' 
  AND token = '8jIrvXJzw9KCmG1RGAdIhIlsdiyjLKB97VZ10iFhX2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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