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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e98893fa9586ba95137dc84aef3d0756a1f885e74d17affc112a6917ecc314' 
  AND token = 'Z+WYqbAhspcEvT3l2ZDXe0B34bRbxo+/1xexdFLRa+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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