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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea87b9f11bb3d64bd2d85b66a0bd0c96bbd9d978ea739a667486212df86fa114' 
  AND token = 'fCrLkp5MJTcYsOO1EtpOnrHmYBYf7Aq4cigURtm1iF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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