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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79eaaa4f63e142c230d73aa2b6561907036d7733049616b1d113eaf0d834ffee' 
  AND token = 'G3YKBcPU2d/+tM1+nin846AeBo3ZvMNyTD0tRF9776s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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