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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b021cd92c8d8ce65884405aea6126ce7dd5b42ec51fd0582a063656291bc275' 
  AND token = 'j1y8EtmBSNAlA7ofKBFXVQ1DpDpr/Zm6Wo3Dfvd6ogI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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