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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fd214549e4bdf79bdd95ca67f446fa8d4942912bbac779010a5d936a6f8216' 
  AND token = 's9fnAdGJLwzskWARf0hnwDkf5KS8BBtb2a+PbegCngc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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