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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd800aa3a79a29688cb7e24bb674db5eef6797d07453ab4f956215fcebffa81d1' 
  AND token = 'BL8W7G0ghvISaSNBRQtJPrPPTTvmbDtVPxnt1A9Q/BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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