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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b1e7f10a4654e92a68e8305c6b6d8cedd0425c21f4acc853b2c5e7c41e2d70' 
  AND token = 'fRGjo1VcKfcO3y4jkbPXy2jrMlyHEM8VJ5b3S4r6jI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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