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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad12ad982deb5d67fefd0c1283026b69261b05d5f1c88a8d0e52a63d3757a671' 
  AND token = '8T9F8uMt33L6PMtCiN3T/wWqyJwJiLM+PRI1AEyVEkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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