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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65e505b4886965ddc99b404fc2b028c0d1af1829634fd56d8c893fedfbe4dbd8' 
  AND token = 'f+pjmDtIjIt5Ay1j625vkgoiaG03imN06bft/ntn7io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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