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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936ea5bcd05ac1b26c59d488aa42fbf968f3f54846caf61ceb113f3727d3baf4' 
  AND token = 'V0RnIgrNHw+P/kfwRNVABkk7QN9xelAsiF6afX7weAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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