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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd551e3bdf533a7aaff7852163dbefa336522268e92896c5dd1841d4aec9350' 
  AND token = 'COdspN5vCHiiVv3gZYZ8rUMgcKJqv7v8vDB0W7adND4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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