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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b42a47c15dca00d3566dab3500c02bd2e38789784b537ff5909befb75cf5bc' 
  AND token = 'EXuZcFaNGErth0OXzkLz1EFcIhVScwuHs/K0hsZL6cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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