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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02aa8bcc1bcb59bb78c436ecbe080aaf5728d229c1b8fa2dd71d27c4d4246c0' 
  AND token = 'DPK7dexyXNII+4KR4zE+fZsbJycnyd4fceQm2IUAF14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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