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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e391fa79ba9682a3603c72e50478eec5a29331c6b9b016234e10f1dc9afd23b' 
  AND token = 'TGUH3pe7hUXJIopeiJWEf6ZZP450aoVr/lQd3qW4n2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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