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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32f5de5ae0814957bb6972de3d43b9d08dd3e039c2977a8ec46be9d5a796477' 
  AND token = 'cnRGItrR1cDP5rx8ysMvy4hb7HFj3IXd8exUJiMa/tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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