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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb36086a4eb75014ca62ad934c305b55174d49fd2c4840133cfa41ad15c0fe14' 
  AND token = '6jPkJldYbCdQawj1imWstwqywzkVDU85Q/V0ftjRNJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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