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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148902cae1771b91605a21c406a65f547ab80325687df2aada79ab2acfd5c4f1' 
  AND token = 'fIXBtbbV+HBHjpxzHh5jzQF65403H+CkPv5drTFyKiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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