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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27028ec0ae6628acb5830e91e111bdcd4f506d61796aebbf63655bf0f555f7ae' 
  AND token = 'mgFKZ3RkHBNXIGXNodHhta8R9+rb43M6ZsNIwwZFf1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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