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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ef8712236fd88539fdd1f82b61c4c8ea4dd4bcf85d5b0c3176fee9d113f598' 
  AND token = 'BCf/nlP0JdJ9Yqox5fj59acp0Up3Fk/r0xxWjrT1UiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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