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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7e73b2695337b7c7297e25794538bed9dd7039e0eb015e4303083afcf26bd9' 
  AND token = 'UdV3fd1t7cn37rSLAr2JeFw7FRo6O9oWV3YhMLuzgnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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