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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8402ad035adbfc685eae35f5e2c58106f9b0497d7d3fbc10ffacd436e3b0ab2' 
  AND token = 'TuiAQfv7gmYDeg83tnq5VGdi3+JiXf4nNyivO6KyKDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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