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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99d89623bc0a2c5a106a97ee22fadddba90ed9ee6b05d5a61676735b4e1ef50' 
  AND token = 'ugrd/XMJhg6RO57v6+Yi+iiJnVDhUHr7fJ8f5qBo2Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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