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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62545f5af07cba413ce94ea1d77a6fe1d6516ba4f67647f036bfecf2a2c61cc8' 
  AND token = 'qPUrIDhFCLg1Gdj0zekkQVSj0ZXDQHLHaAbnQWi70NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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