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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '224d9fa6fb2b2834c48102da0eec6722bdbf8d0484ede15bc6ed7f112add7bad' 
  AND token = 'OlsKoSGhmV7YUf0/ad69vnbX0FFocADd2azS/F6ntgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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