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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef93cecd23fe196370b413177d0b01dd355dae49ab3310c37debe85f24d7a5d' 
  AND token = 'DBLOiCRlP39Q8VXZhY0iwafVlgYvkyeOG2DvkFsxl4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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