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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc970444bd756adea6efb72519b66831ee717ff7572d1860f56d97fc9e390fa' 
  AND token = '3NucP2nsQ4HLe8iPnjn3zncV9NczKu7A+/o4OJlS01Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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