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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9a2c3dd4b9e15d232ca460eb56a549c84072b17e83ed01e5082c21fc1bd060' 
  AND token = 'az/RX2Wx5uB22VHyQVROHOd8ULGodQyJCOCmOJqUcVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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