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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8689ee0815d39a8cc6ecd2172155b556f1f098938f8b6ccb0bb03048caae0ed5' 
  AND token = 'TI3n+ySGmmEpCFBZKUv6Kxe/dqzjwSMBNAZEzc0roUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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