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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94d880cbb11bbdc7a04941d97f78db0a0fe9827c1d7f18a1a6fdd9e04f1f3e2' 
  AND token = 'tHksYvbcsMj37t0WTJ1cytZhpcvYflMWf8uD4Zzo97c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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