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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c7735dcc1b484ad709629caeef2d0e8c1e2ed54096d20678def82fdfc05d9b' 
  AND token = 'xCAuax5zjfhMExqtmR7AHu8MhSk0uIWIiBsoFr2ex/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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