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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '533519939a9bc58a04529dee89992bb87f3e891069f89b086e4feb1f7b5191d2' 
  AND token = 'uGXAAVNDoFaV8C6RmFkdeDaafTDbYre3W4rrftc8om8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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