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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43c0b802e466857299988b7936682c4fa6bb73a1d33419640ba82abf6ff26d4' 
  AND token = '2NrbQs4JLBnVrv1faPKPZKIAHEK+3KAvcez0G71gMv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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