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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c5ba2d7fdc8292c55ae3b9dd31b1d3a38f56804260597d17f0740054c9cc2ce' 
  AND token = 'YaqlEJOQWbP8zu5q11ElYm+7GYIrIfWabgE/NPSBXWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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