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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d373f32bf733d1a789560819a64c510cb10a30bf512c8fba95febf5c17dcd5e' 
  AND token = '1crhZIcSRuGY464IWSI5P5Tf6OsLyDUw+YBtXwTD84g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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