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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0fc65305562a33552a6b9a85a3d9176c14a5d1ac4437112e8be1d14e6d96a0' 
  AND token = 'Enh3bQZWGHhyQ7kBfU8u5Ku9FibhBEdHFRi9fljiXGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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