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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07993016fcf139b5a3b3b1a63796c4072a8347962367966d45055177301cbce2' 
  AND token = 'b3ttZmkic+yEvNaijh78bt9JHwa+nfwE24kIIiXuV0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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