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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efcd14a39fc112c5946aae6b9979c442446221caf86df285d6b86830b162eae7' 
  AND token = 'w+6B3+KaGsZco4Sss8yUxjzjhEH63PHsic/sNksX8Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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