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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '346751ce3a4cc2afe165ef314033ed9554382f7e5f456484aeedc03b771646af' 
  AND token = 'tbZlx8w9XcYNNipL2UFf5Ngla37wTSWZXqF9tmrfRK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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