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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fc64ca3af025b5a86df9ca009fcc5d41a7682af2bb4a309ccde7e8eed9bc22' 
  AND token = '4XQEl4QQ4tc0K5KIlrxu7jjsgHhd8z6RePJJlsqwp10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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