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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26bcf400500ca6d8c79f50d118568fe5a27ab180d4bcaaf87b0de0ed571f4475' 
  AND token = 'csuA/t3yZoR8hiRgMl/Ocaiex4sbb1pB3MJ0D9rcSZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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