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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5475ec0f917379edecddf594c363232acdb61be8562e46c57528ac1b7334649' 
  AND token = 'duAzf1kNRmomVVHs0O3kVpl+JwBCminp7OVWDpgNNbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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