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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '080231cc6e97a5a0fd0ff9f704b40ad7aee356dcb2a92a03628afabbd1ea54e6' 
  AND token = 'YShcL5pT41062yaiTYbuqxNBOR/QxtD8ix5rporf1Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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