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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff93abe8a1de67e2a995a8af1d35065223eb1eadb9fb567ab789a4cc6deee71c' 
  AND token = '/Bm3pvu8z9M2exdTVaidbfoo1AuT0oWAobnU0agVggw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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