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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b78ac367861a61aa7ef6a10d0e4f07dba546c443ba01675380450901e1474101' 
  AND token = 'uYpwZXAtT20hzDcIgwBXvAHynNreV2uPnR+3knzWl3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00133

JSON explain

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