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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce64cbaf01114a0272a6294fad90b99d26f34b9b2c1a99c31198ccc0c58fd985' 
  AND token = 'NRhUpTFvPS78vhi7p+nPS87N0TSnxZpO51Wqe+vx+sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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