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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27705b6098cb5c1023168928881c70541538656d6cc2575d3b7f9d3ab7112f72' 
  AND token = 'bjiNP967ICHbjhdrQ0KXcVIvD/+0RJdUCgYcvyWHCf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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