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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f2d48fc48fc3ebd5e631f2f533d79b0befb26516e96e0d24e8991da20e2395' 
  AND token = '2BuH8EC311Yx4k6UHyToBeT5Z2d3BMk5kq4CpbYgPm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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