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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87eba4a0bc80c6e4c6dc788ff9957215c3b905c7290d1251c5721e68602196aa' 
  AND token = 'bMS4A7XhGO4M1lOi+zbHi0mq9LWLIj6floMQhJNGA2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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