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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ebb6fb7fb5155fa53b5ad247effd55e20268fe0d11cdb1a213f0d6f6de76ad' 
  AND token = 'WNp+I6nS4rW/GosQ7txhdDCktL74tVGUVCo5Fmj8xaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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