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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58525f8122b992c6574f0e9eaa116f9335cd2bb1fdf567e2ea7d577474b70966' 
  AND token = 'gXa7LERk5bOpK7ggSpko69zpkNOl0S6g9F1lpjwjS/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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