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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6920b9437231cf0b77f4e77859c3ebd39205e85ca1ae90c442b9e24698ff74f1' 
  AND token = '43pzb3dBkj/fbQawo1xsRrk5b2sxFdkf3h18MBjJhrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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