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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979655e924370a042784c57e88fae89e5d6412c3f98fa2ded42a8cf1b51a74d9' 
  AND token = 'FwWfabbwyP8guA+y5wfhMmgRpTgJHa3FRUTY2ttrdDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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